Raoul Pictet

Raoul-Pierre Pictet

Raoul-Pierre Pictet
Born 4 April 1846 (1846-04-04)
Geneva
Died 27 July 1929(1929-07-27) (aged 83)
Paris
Nationality Swiss
Fields Physics
Institutions University of Geneva
Known for Liquid nitrogen
Notable awards Davy Medal (1878)

Signature

Raoul-Pierre Pictet (4 April 1846 – 27 July 1929) was a Swiss physicist and the first person to liquefy nitrogen.

Biography

Pictet was born in Geneva and served as professor in the university of that city. He devoted himself largely to problems involving the production of low temperatures and the liquefaction and solidification of gases.[1]

On December 22, 1877, the Academy of Sciences in Paris received a telegram from Pictet in Geneva reading as follows: Oxygen liquefied to-day under 320 atmospheres and 140 degrees of cold by combined use of sulfurous and carbonic acid. This announcement was almost simultaneous with that of Cailletet who had liquefied oxygen by a completely different process.

Pictet died in Paris in 1929.

Works

See also

•Pictet's apparatus • Production of oxygen under pressure in a retort. Two pre-cooling refrigeration cycles:

1. first stage SO2(-10 °C) 2. second stage CO2(-78 °C) oxygen flow is pre –cooled by the Means of heat exchangers and Expands to atmosphere via a Hand valve

References

  1. ↑ For biographical details, see Sloan, T. O'Connor (1920). Liquid Air and the Liquefaction of Gases. New York: Norman W. Henley. pp. 152–171.


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